Duplex vertical surface grinder



Nov. 2 1926. I Lawns J. A. DOANE DUPLEX VERTICAL SURFACE GRINDER Filed May 31, 1923 6 Sheets-Sheet 1 7' I 54 n o l l ATTORNEY ATTGRNEY Nov. 2 1926.

J. A. DOANE DUPLEX VERTICAL SURFACE GRINDER Filed May 31, 1'923 Nov. 2 1926. 1,605,178

J. A. DOANE DUPLEX VERTICAL SURFACE GRINDER Filed y 5l 1923 6 SheelZS--Sheei'l 5 Nov. 2 1926.

J. A. DOANE DUPLEX VERTICAL' SURFACE GRINDER 1923 6 Sheets-Sheetl 4 Filed My C51.`

\. INVENTGR ,/l//l/l/z// K/ ATToRNjEY ATTORNEY 6 Sheets-Sheet 5 DUPLEX V Nov. 2 19,26.

J. A. DoANE DUPLEX IVERTICAL SURFACE GRNDER Nrw@ 2 i926.

Filed May 3l 1923 TTGRNEY mentener. a, une.'

untreu srares PATENT oFFlcE..

JOHN A. DGM'E, 0F HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COM'. PANY, OF NEVI YORK. N. Y., .E CORPORATION 0F NEW JERSEY.

nUrLnx 'vnn'rrcan Application led May 31,

v. or operative position.

Also itis un object of the invention to pro vide improved indicating or gaging means 'operating to indicate the progress of the grinding operation and also indicating when the grinding operation has been completed on the Work pieces mounted on the table in operative position.

Another object of the invention is to provide a novel form o Water guard completely surrounding the operative table to prevent Waterused in connection with the machine from being thrown out by the ivhcel. This guard comprises a number ora plates adapted to move in a manner to permit indexing movements of the tables into and out of operative position.

A further object of the invention is to provide driving means for the Work tables which will be operative While each oli the tables is in pomtion for grinding and inn operative While they are in their position for loading.'

In addition, improved Water controlling means are provided which permit water to be supplied to the Work on thetable in operative position and Which will discontinue the supply during the indexing movements.A of the tables.- For this purpose, a conduit is provided carrying the supply oi water to the area Within the periphery of the Wheel, a valve in this conduit being opened and closed by means on the indexing member.

Also improved driving moans for the grinding wheel are provided tfonnecting the wheel spindle with a motor. preferably mounted within the base. The connection is such that it permits vertical adjustment of tion, l have shown my invention embodied sUnrAon Gm'nnnn.

1923. serial no. eiaeis.

the Wheel spindle'vvithout effecting the driving connections and also permits proper operation when the motorand Wheel spindles are slightly out of alignment.

Generally, the improvements incorporated in the grinding machine and forming the subjectmatter of this invention permit an operator to load work pieces upon one offthe tables While the grinding operation is taking place on the other table.

When the grinding operation has been completed on Work pieces on one table, in-` dering of the tivo tables takes place which may be manually controlled. By means of this indexing movement, the table which has been in operative position will be rotated to its inoperative or loading position and the table just loaded With Work pieceswill be rotated to its operative position. In this' Way, the machine permits practically oontinuous grinding operations upon blanks as the grinding is not interrupted during the' time required to load and unload the 'work blanks on their respective tables.k

With these and other objects in view, my. invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part ot this applica in a duplex vertical surface grinding ma- B5 chine but it is to be understood that many of the objects of the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawings annexed hereto: p

Figure l is a side elevation ot' the complete machine, parts being broken away to more clearly show the construction of some of the parts. i

Fig. 2 is a front elevation of the complete machine also having parts broken away to more clearly show their construction.

Fig` 3 is an elevation in section showing the driving means for the wheel and the mechanism for indexing and rotating the work tables.

kchine showingl the arrangnnnent of Yber through a portion porting the wheel head l2.

Fig. i is a. plan view oi the complete inachinej the parts being' broken away to more clearly disclose the mechanism for indexing and roi'iatingl tie Work tables.

Fig. 5 is a plan View of the complete inathe guards sui-rouudiner the table, a side of the column being broken away to show the Wheel 'feeding mechanism.

Fig'. (i is a vertical sectional view taken on the line 6-6 of Fig. 7 showing' lthe indicating' means forming a principal part of this invention.

Fig. i is a side elevation oit the same parts.

Fig'. 8 is a sectional vievv taken on line 8-S of Fig, 6.

Fig. 9 is a mechanism.

Fig. i() is a vertical sectional view showingr the controlling means for the Water supplied to the Wheel and work during the grinding: operation.

Fig. ll is a rear elevation ot the wheel feeding means, and I Fig. l2 is a sectional View thereof taken on line 12--12 of Fig. 1l. i

In the above mentioned drawings, l have shown but one embodiment of the machine which is non7 deemed preferable but itis to be understood that changes and modifica.- tions may be made Within the scope ot the plan vien7 of the indicating appended claims Without departing from the spirit o1" the invention.

Briefly, my invention in .its broadest aspeet comprises the following; principal parts: first, a base; second, a column on the base; third, a wheel head adjustably mounted on the column and having a rotatable abrasive Wheel therein; fourth, driving.,Y means for the Wheel preferably comprising a motor within the base and ilexibly connected thereto to permit vertical adjustment of the Wheel head; fifth, an indexing member rotatably mounted in the base; sixth, tivo rotatable tables on said member positioned preferably at diametrically oppositely disposed points; seventh, means to rotate the indexing memof a revolution; eighth. means to rotate the tables when they are in their operative position relative to the abrasive wheel; ninth. improved gagring means to indicate the progress of the grinding operation; tenth, Water guards enclosing the table in operative position and permit ting indexing movement thereof. and eleventh, controlling means for the supply et Water to the Wheel and Work.

Referring .more in particular to theiigures of the drawings, a base lO is provided. having` a column il mounted thereon 'tor snp- As shown in Figs. Land 3, the column 1.1 is adjustablv mounted on and ser-tired to the base by means of special attachingy means., Three sleeves 13 are threadedly mounted- Within the base moeite l() so that by rotating` them their upper son li'aces are vertically adjusted.. The column ll rests upon the upper surfaces ot these sleeves i3. and, by means oi' Suitable bolts ifi is retained in fixed position. Locking means in the form ot nuts 15 may also be provided for holding` the sleeves 13 in adjusted posi` tion. is shown in Fie: 3, a Washer 1G, one surface of which is sphericalfis interposed between the coliiimn il and sleeve 13 so that. adj ustinents of the column may be accommodated. rlhe above described. means enable the column to be readily adjusted so that the wheel head l2 will be disposed in position to move in a direction precisely normal. to the surface of the work tables. F or this purpose, suitable vertical Ways are provided in the column il.. As these may be of any de sired i'orm7 they do not require to be specifically shown or described.

The means for adjusting the Wheel head. l2 and for rotating the abrasive Wheel 17 therein Will presently be described. First, the mounting and indexing' mechanism for the work tables will be described.

lllitiiin the base l0, a. supporting member 2O for the tables is rotatably mounted in suitable bearings and is provided with an internal gear 21 mounted coaxially with its axis ot rotation. This gear 2l. may be driven by a pinion 22 mounted on a vertical shaft 23 disposed Within the i0. Shaft 23 has splined thereto a clutch member 2i which may be moved into or out of engagement with clutch teeth on a sleeve 25 surrounding the shaft For operating this clutch member 2li a jiivoted hand lever 26 is provided7 one end of the lever 26 engaging @circumferential `groove 27 `Within the clutch member. rillie driving means for the sleeve 25, the shaft 23 and pinion 2.2.1. 1vhenthe clutch 2l. isin engaged position.. comprise the following parts. A Worin Wheel 28 on a sleeve 29 provides driving means for a sleeve 30. Preferably worm wheel 28 is driven a worin 3l on a horizontal shaft S2 provided with a sprocket 33 adapted to be placed in connection with the a 'mature sha-tt et a motor 34 by means of a suitable chain 35.

As it is essential that frictional driving means be used for driving the shaft 23., the sleeve 29 mounting the worm Wheel 28 is therefore provided at its lower end with a flange 36 .vhich is adapted to be engaged with another flange 37 fastened to the intermediate sleeve 30. "The pressure between rthese tivo iiaug'es 3F) and 37 may be adjusted by means oi'f the threaded nuts 38 engaging the intermediate sleeve. Rotation therefore oi the outer sleeve 29 frictionallv rotates the inner sleeve SO and. clutch teeth are provided on sleeve secured to the upper end of this latter sleeve, the driv ing` shaft Will be rotated when the clutch Leonie/e is in operative position. 'llirough this tric-n tionel Ineens, the motor 3l drives the vijorm Wheel and -the outer sleeve 29 while the tables ere being indexed into and out ol: their 'operiitive positions, and prevents breakage of the ports should anything interfere with the operation of the indexing movement.

In order to index this rotating or indexn ing member 2i) through exactly one hult' u. revolution end retain it in fixed position :it the end ot each indexing: movement, e pin et() is provided adopted to slide vertically Mld enter u. depression il in the fece of the lntetnel gear 2l when moved to its upper position. This pin Il() may coim'enienthY be mounted sothet its lower end rests within :i portion of the lever 26 ier opereting the 'ol'tlttih 2li. Also the lever 2li is normally tinged in a direction to disengege the clutch @lend cause the pin 4:0 'to enter the depression ll Within the internel gear 2l by e spring pressed plunger il-2 engaging en arm lf3 on the lever QG. lt will be seen from this construction that upward movement of the lever 26 will cause the clutch 2l tofengege the driving sleeve 25 to start the indexing movement o't the rotatable member 2() and will simultaneously disent-rage `the pin 40 rom its recess. fis soon :is the member 2Q starts to rotate the clutch 24. is held in engaged position by pin llt). is long as this `pin 40 is prevented from enteringI one ot its depressions Lil, it cannot move-upward and clutch Qfl is retained in. its lower position.

`With the parts in this position, the member 20 `with the pin Ll() urged against the lower 'faceof the internal geur 2l is caused to the ri'ituiibie type adopted to rotule slowly rotate. As soon the nieml er 2O has rotated so that the depression /ll in the internal geur 2l dienietrieuily opposite the first depression is directly above the pin l0, the' vpin will move upward to engage it. lllovement of the pin ll() will then permit oscillotion ot the houd lever '22h13 und will simultaneously disengfngfe the clutch lllounted onthis indexing;` member 2O are tivo vvorlr tables Preferably these ure ol ubout axes parallel to and ut n distunce trom that about which the member 20 is rotated. These tables 45 muy oe driven by means ot spur sieurs fili formed integrally therewith. il. control hub portion el? oi the tables i5 terms e journal fitting `within a; suitable bearing in the nien'iber 20.- zilso et the periphe 'y ot euch oi the robles l5 is e cllcilimiil.u we le in context with en unnulersurhe member f3, thm, torn'iing uv thrustlli'xcai to nud rotating with each bearing. of the tables lo is e cimeli' if) preferably oi `the magnetic type but obviously e chuck of any othertvpe muy be used. ln engagement with the spur fleurs on each ot the tables flo is fr lpinion o() mounted on the upper end ot u short shell; rotatable Witlr in the indexing member Q0. 0n the lower which iney-enguge a pinion 53' on the upper end of another vshort shaft 54. indexing movements ot' the member 2O cause thc driving gears ."iiior the tables l5 to be moved into and out of iuteiineshing position with their driving pinion 53.

From the above described construction, it will be seen that when the tables 45 are in their operative or grinding position the'geur on the driving shzrft 51 for the table l5 will be rota-ted by the pinion 53, when it .is indexed to its inoperative or loading position the gear 52 will be disengaged from the pinion 53 und the corresponding gear oi' the opposite table l5 will be brought into mesh therewith. ln this way, the table 45 in operative position will be positively rotated While the table l5 in inoperative or loading position will be free to be rotated manually to facilitate the loading operation.

The magnetic chucks lr-9 on the tables l5 muy be et conventional form und per se lorin no part of the present invention. A specific description thereoll will therefore not be necessary. As these chucks 49 ere roteled into and out et' operative position, special ineens associated with the index ine-1noer 20 ure provided to magnet-izo end de magnetize them. @n thelower fece of the lisibles lo are mounted Contact rings G() preferably embedded in a ring 8l of insulating material. '.lhese rings 60 are electrically connected respectively to the terminals ot the coilwindings oit the chucks 49 in any desired menne-r. The contactrings 6l) ere engaged by spring' pressed pluugers 6:2 electrically connected 'with segments 613, the

'pioneers Gi und segments G3V being mounted ouslj.' in contact with u source ot electricity tim-.ugh il'iluneers (32.

Fixe-d to e portion ot the base l0 is u, sui-.ill brochet G5 on which are mounted two eontzu-t plugs (5G suitably insulated from euch other. These plugs 6G ere adapted to be connected to e suitable source of current in :my conventional manner. Their upper ends resiliently press against 'the ments (5I- on the rotetble member 90. Similur seojments 63 und pioneers Gi?, ure mounted on dinn'ietricolly opposite portions of the rot: table member 2O adjacent euch oli the tziblesl. -ln either indexed position of the member 52() therefore one .set ol: the segments G3 und pionniers GQ isin Contact with the source ot' current und the chuck 49 connected to the table 4,5 is therefore energized. Furtheruune, as the plugs beiv are disposed directlg.7 below the operative table, the particular teble in operative position relati e to the wheel 1'? has its chuck@ enerl5 and moved away from operative seg-ments 33 disengaged gized. As soon as one ot the tables its ehuel Li9 is position.y the :from the plugs 66 and the chuck 419 beoomcs de-inagnetized.

The driving shaft 5st for these tables at its lower end is provided with a bevel gear 70 adapted to mesh with a .bevel gear il on a horizontal shaft 72 having a plurality oit' gears 73 of different sizes slidably mounted thereon. Shaft l2 lies adiaeent and parallel to' a companion shaft 74- also having a pluralit? oi" gears slidable thereon. Bv means ol rods 7G extending parallel. to and below these two shafts 72 and 74, the gears 73 and 75 on the two shafts may be moved to different axial positions so that the driving shaft -ii for the tables 45 may he rotated at any one of a number of dilYere-nt speeds. As these shafts T2 and 74 and their gears 734 and 75 of diilerent sizes form a change speed mechanism of a conventional sliding rear type, it is not thought necessary to describe it more particularly. To move the rods 7G Controlling the positions of the slidable gears T3 and 75, a hand lever 77 is provided.

i rhe drivingcshatt 74; of this. change speed meehanisinistoreerably in driving relation with an intermediate shaft 78 through a pair of spur gears 79 which intermediate shaft is driven from the sprocket 33 on the driving shalt 32 by means of a second pair of gears 80. rThis construction permits the tables to be rotated at any desired speed while in operative or grinding position. and to be free to be rotated manually when indexed to their inoperative or loading position.

Preferably a frictionel connection between the. driving shaft 32 and shaft 74 is pron vided so that the taloles 4-.5 may be started rotating gradually and without undue shock or jar. For this purposes multiple dish type of clutch 82 is mounted on the driving shalt 32, the driven member of which carries one of the gears 80. To aetuate this clutch, a spring 83 is provided normally forcing the disl-:sof the cluteh 82 into operative or driving` relation. '.lo release the Clutch which is accomplished each time the member 20 is being indexed, a lever 84 is plvoted adjacent the clutch 82` an intor- Inediute portion of which engages a part of the Clutch 82 to disengag'e its disks. At the free end of the lever 84e., a `roller 85 is mounted which. duringF the indexingmovement oi" member 20., rides on its outerlpcriphery. lilith the lever in this outer position the clutch is disengaged. ds the men'iher 20 moves into each oi" its operative positions` the roller 85 enters a depression 86 toi-med in the periphery f member 20. This depression permits the lever 84e to oscillate slightly under the influence of the spring 83 .which renders the lineaire and sufficient to cause disks of eluteh 82. As soon, therefore, as the member 20 has moved one ot the tables l5 into operative position7 the driving means beeoine operative to rotate it. fis soon, however, as the member 20 starts its indexing movement. the clutch 82 becomes disengaged driving means for the tables 4:5 inoperative.

From the above. it will he seen that when. the grinding* operation on worlr Vil n'iounted on one of the tables 45 has been completed and the other table loaded, the operator has only to elevate the hand lever 2G. Movement of' this lever 2G serves to indes; the tables L15, start the one moved to operative position to rotate and simultaneously en ergize its magnetic chuck 40. Also during; this index movement of the tables 45, the guards enclosing the operative table are deflected out of the path of movement or the member 20 and the tables 415 to permit this indexing movement.

During the (grinding operation. the Wheel 17 together with the wheel head 12 is moved downward, this being accomplished either automatically or manimlly.v These means will now beadescrihed. A rotatably mounted screw 9 provided suitably supported against axial movement within the column 11. This engages a nut 91 fixed into a 'pro- `ieetion 92 formed on the wheel head 12 so that rotation ot the screw raises or lowers the wheel head and its attached parts. To rotate the screw 90, a worm wheel 93 is lined thereto engage by a worm 94. The worm 9-/1- is keyed or otherwise fastened to a hollow shaft 05 suitably mounted horizontally within the column 11. Rotation of this worm 94 and its hollow shaft 95 therefore serves to feed the wheel head 12 upward or downward. y

rlhe means to rotate the shaft 95 and its worm by power means preferably step hy step to slowly feed the wheel head 12 downwardly during operation will now be de-. scribed. 0n one end ot the shaft 72 for rotating the worlr/ tables 45 is a helical gear in mesh with a heliealgear 101 on a short shirft .102 mounted within the base. This shaft 10:2 carries an eeoentrie Cam 103 which will he rotated while rotation oit' the tables 15 taires place. Contacting with the periphery of the cam. 103 is a roller 104. on the .end of a reciproeatin er rod 105, the opposite end of which is provided with raelr teeth 106. segmental rear 107 on' a transverse shaft 108 in rear ot the column engagement of the .11 is oscillated Yhy the reeijrirmatory movements o the rod ltl whieh oseillates a lever 109. A vertieil rod 110 hinged to the transverse shaft 108 is therefore reciproeated vertically. The upper end of this latter rod 110 carries an oscillating member lll having a pawl 112 engaging a ratchet Wheel 113 on the shaft 95 carrying the Worm 91., This ratchetwheel 113 is theredownward. A hand wheel 111 fixed to the y forward end of the hollow shaft 95 permits manual adjustment f the wheel head 12 in either direction when paivl 112 is disengaged so that the head 12 may be adjusted manuallyv from the wheel 113.

By referring to Fig. 11, it will be seen that the oscillating member 111 carrying the -feed pawl 112 is normally held a spring 115 with one of its arms against an adjustable stop 116. Vertical movement of the rod 110 oscillates the member 111 away from the stop 116 to advance the ratchet Wheel 113 and feed the Wheel head 12. By

Varying the position of the stop 116 the oscillatory movements of the member 111 may be varied to increase or decrease the amount of feeding movement given the Wheelhead 12.

Associated with these Wheel feeding` means are additional means enabling the feeding movements of the Wheel to be stopped at any predetermined point. For this purpose, the pawl 112 is held in operative engage- .ment With the ratchet wheel 113l by mag nete means. An electro-magnet 120 when energized draws its armature 121 toward itself which movement oscillates a membei' 122 carrying the armature 121 .and the pawl 112 against a spring 123 which permits .the pawl 112 to ride upon the Wheel 113. When the magnet 120 Ais deenergized by having its circuit broken, the spring 123V oscillates member 122 so that the paWl 112 cannot engage its ratchet Wheel 113.

To interrupt the circuit for the magnet 120, a contact is made through the ratchet Wheel 113. This Wheel 113 has metal rings '125 on opposite sides suitably joined together electrically and properly insulated from the wheel. Contact plugs 126 and 127 resiliently engage these rings so that current can flow directly from one contact 126 through the rings 125 to the opposite contact 127. This circuit also includes a source of current, the electromagnct 120, and a manually operated switch.

Contact 127 constantly rides on one of the rings 125 but contact 126 may be forced away therefrom by an arm 130 mounted on and rotating with the' ratchet Wheel 113. It will he' seen therefore that by setting the arm 130 relative to the Wheel 113, the circuit may be interrupted and the pavl` 112 thrown out Jof operative position at any point in the downward feeding movement of the ivhccl 17. ing movement occurs when arm 130 lifts contact 126 from its ring 125.

To adjust the position of the arm 130 so This interruption of the feed` ,hub member 133. By means of a clamping lever 134, the relative rotative positions of the arm 130 and the sleeve95 may be varied.

Thus by clamping the member 133 in pre, Vdetermined relation relative to the sleeve 95, the feed may be continued any desired amount and then discontinued at redetermined points. `fly-these means, t e Wheel 17 may be fed prec1sely to a predetermined position relative to the Work table 15 at which point further feeding movement will be prevented. i

As the pawl 112, While in its operative position, Would prevent manual upward adjustment of 'the Wheel 17, 1 provide a switch 136 in the circuit for the electro-magnet 120. By opening this switch 136, the pawl 112 is moved out of contact with the Wheel 113 thus-enabling the sleeve 95 and the parts carried thereby to be rotated freely in either direction tot adjust the vertical position of the Wheel 17.

One of the principal objects of the present inventiony is to impnove the indicating means usable in connection with grinding machines permitting the* progress of the grinding operation to be at all times evident to the operator. As the Work tables 415 are indexed into and out of operative position, it is not practicable to have an indicator directly engage the Work W on thesev tables. A separate member 140 mounted adliacent the operative table 15 and adapted to., be engaged by the abrasive surface of the Wheel 17 is therefore provided. An indicator 141, having a pointer 1411, has an extension 1.42 which constantly bearsa-gainst the upper horizontal surface of this member 140. This upper surface of the rotating member 140 is also adapted to be contacted i by the abrasive surface. ofthe Wheel 17 si: i

multaneously With its engagement A 'vith^.the Work pieces W on one of the Work tables 45. The upper surface of the rotating member 140 Will therefore be abraded to apla'ne exactly ,contiguous With that of the upper surface ofthe Work W. Also the abrasive action of the Wheel 17 upon the Work W on the Work tables 45 may be observed by its corresponding abrasive action iipon the surface of the rotating member 1110. By means which will ne described, the rotating member 1510 is elevated slightly With each indexing movement of the tables 45. The wheel 17 therefore contacts with and abrades this member 110 exactly as if, it Were an extra piece .of Work on an independent table.

, shaft 1119 and sleeve 111-8 driving connections from the driving shaft 72 for the indexing member 2() and worlr tables This shaft 72 through helical gears 1113 rotates an elongzited shaft lfl-l. An extension 115 thereto having a bevel gear lll-( at one end is in mesh with a bevel gear 145i' on the lower end of a vertical sleeve 1418. lVithin this sleeve 1/1-8 is a shaft 149 splined to the upper end ot which is removaljily mounted the rotatable member 140 contacted with by the wheel 1?'. This sleeve 148 and shalt 14) rotate within suitable bearings 150 and 151 fixed to one side or the column 11 preferably in manner permitting convenient vertical adjustment of the parts.

Un the indexing member 20 for the worlr tables l5 are diametrically opposite cam shaped projections 153 outstanding from its periphery which are adapted toengage a spring actuated plunger 1541-. @ne ot these projections 153 strikes the plunger 154-. with 'each indexing1 movement of the tables 45. Movement of this plunger 154e, through means shown clearly in Fig. 8, rotates a ratchet wheel 155 splined to a vertically disposed shaft 156 parallel to and adjacent the for the rotating member 140. A gear 157 on this splined shaft 156 engages another gear 158 on a sleeve 159 surrounding shai't 14:9. This sleeve 159 is threadcdly engaged in lts sup-` port 151 so that the elect ot' each movement of the plunger 151 is to rotate the sleeve 159 and advance it axially a ,slight distance in accordance with the lead of its l't will bel `therefore that with each indexingV movement of the tables L15, the rotating member 1&0 will be elevated. This vertical movement will be very slight and in use one or two thousandths ot inch will be suflicient for its purposes The vertical movement ot the rotating member 140 also is timed to take place during' the indexing movement of the tables 45. [it this time, the Wheel head 12 and the Wheel 17 are elevated above their operative or grinding position so that no abrasive action occurs upon member 1110 at that time.

lfVith work 1V to be ground mounted on the table 45 in. operative position and with the rotating member 140 elevated the one or two thousandths, the wheel 17 is fed downwardly either manually or by power in the manner above indicated so that its abrasive surface contacts with the work pieces l/V on the table 45. As soon as the Wheel 1'? has been fed downuf'ard to within one or two tl'iousandths ot its final position, its abrasive surface will contact with and abrade (he rotating member 1-10. Thereafter, it will be seen that the surfaces of the Work 1V and the upper horizontal surface of the rotating member 140 will be in exactly the same plane and will both be sireceive completion of the grinding operation on the work 1V may be noted and further abrasive arti-ion discontinued.

.lt only when the -work pieces 1V are practically finished that the abrasive Wh fl 1 7 comes into Contact with the upper in.J surface oi the rotating member 140 and continued downward movement et the wheel simultaneously grinds the work pieces W and the member 1110. This rotating member 1410 is therefore worn away only the distance it is elevated with each indexing movement of the tables namely one or two thousandtbs of an inch. As soon as the indicator 1-11, the pointer 1410' of which is in Contacty with the surface el this rotating member MO, eon'ies back to a predetermined position on the dial, it is at. once evident that the work pieces Vif have been brought to their final dimension.

1V ith each indexing movement of the tables 51.5 at which 'time the finished worlc il* is indexed away 'from o erative position and new unfinished work ll is advanced for grinding, the rotating member 1410 will be elevated slightly so that it will again be contacted by the wheel 17 operating on the next group of work pfeces. The indicator 141 as shown is preterably vof the dial type and is adapted. to be adjusted relative to the rotating member in accordance with the thickness of the Work 117 in any suitable manner. By these means, the indicator 141 continuously rests upon a member 141() which is rotatable at a slow speed and is adjustable vertically during normal operation through very small distances. The indicator 141 therefore does not' ride upon tte work 17V which frequently is in numerous pieces Widely separated on the tables. ln this way7 the indicator 141 is not subjected to wide movements and its liability to injury or undue wear is materially reduced.

Rotatably mounted about a vertical axis Within the wheel head 12 is a spindle 160 `rari-ying the wheel 17 preferably rotating upon two ball bearings. The lower-one of these bearings 161 has its outer ringlixed within a recess formed Within the head 12. The upper bearing 162 has its outer ring cured within a member 163 slidable vertically within the head 12. rThis member 163 is nominally forced upward by springs 164, the effect of which is to rcsiliently hold the spindle 1GO as high as permitted by the lower bearing 161. The'inner rings of the lower and the upper bearings 161 and 162 are cach secured directly to the spindle 1GO.

The Weight of the Wheel head 12 and its noname attached parts is counterhalanced hy means ot two weights 170, one on each side et the machine. These weights 1Y0/are attached to opposite sides ol? the head 12 by cables 171 passingI over suitable idlers 172. Pret erably the combined weight of the counterweights 170 exceeds that'ot" the head 12 and its attached parts so that the head 12 is held as high as permitted by the threads on adjustingf screw 90. At the lower en d ot' the spindle 160, the wheel 17, preferably of annular form, is attached in any preferred way. l

ln order to rotate' they spindle and its ahrasive wheel at high speed and in a manner which will permit 'free axial movement thereofy over a wide rangeml adjustment, the following mechanism is provided:

Within the hase and directly below the column 11 as shown in Fig. 3 isan electric motor 180, the armature shaft 181 of which extends vertically. Also, "as shown in this llgure,.the shaft 181 has a sleeve L22 attached to its fupper end. The sleeve 182 is'attachcd to the armature shat't 181 by means ot zi. flexible coupling` 'termed by an annular thin metal disk 13?; The outer peripheryot.tl1is disk 18? is attached to a flange 1841 on the' lower end ot the sleeve 182 and its inner periphery is attached to a member 185 and directly keyed to thel armature shalt 181. rlhis torni ot coupling permits limited axial and angular adjust-y ment hy tlexure ot the disk 183.

This 'sleeve 182, as shown, is in alignment with a corresponding sleeve 187 fixed to and moving` with the wheel spindle 1GO.

As the `upper sleeve 187 is in every way similar to the lower one 183 and is lflexibly attached to the spindle 160 in the same 1nan' ner as sleeve 183, it will not req'uire description. Each ot these sleeves 183 and 187 is provided with an axial opening splned throughout its len `1th.

Between the sleeves y1532 and 18? is provided a connecting shalt. 19() having` longitudinally extending projections thereon engaging in correspondingly disposed 'grooves or splned portions in the sleeves.

By means ot these projections und `ebroovcs respectively provided on the shaft and sleeves, driving connections are provided hetween the motor and the wheel 'spindle 1GO pern'iitting' extensive adjustment. Also, as the sleeves 182 and 187 are connected respectively to the motor 180 and spindle 160 respectively by means of flexible couplings the motor and wheel spindle do not have to be accurately aligned. ln this 1nanner, also, the wheel spindle 1GO and wheel 17' may be vertically adjusted to any desired position during` its rotation with a minimum ot resistance. To assemble or disasscmhle these parts or to remove and replace a wheel 17, it is only necessary lo insert or remove lthe shalt vertically throupihan openingwwithin the spindle 160.

lt is essential Ithatkthe taule in operative or grinding positionibe suitably enclosed hy guards `forming suitable enclosing plates So that wsl'ter or other'luid used in con' neetion with the machine may not he driven. outwardly during the ,grinding action. Also these guards or plates must be so disposed and inovably mounted that they will permit inoening movements of the member 20 and tables 15. For this purpose, I form these water guards or plates sov that they are adapted to move to and from their operative positions shown most clearly in Fig. 5.

These guards consist first of a plate 200 mounted in a lined vertical position directly` on the indexing member .ZUVso that it moves therewith. ln the operative positions of the tables 5, this plate 20() stands transversely ol the machine and midway between the two tables lts operativeiiiosition is shown in full lines in Fig. @n eitherA side ot this guard 200 on the iiulcningA member 20, are side plates 201 and 202 hinged to portions on opposite sides ot the column l11. The guard plate on the right is curved at its 'forward end and joins one end ot the transv'ersc or central plate 200. When the tables 41.3' are being indexed, the surface ot one of them contacts with the guard 201 which causes it to he deflected to its extreme outer posit-ion shown in dotted` lilies.

Stl

The guard plate 202 at the lett hand of the loll tables 45 is also hinged tothe column 11 and is provided with a cam-shaped projection 203 at its free or outer end. This projection 203 `is engaged by the periphery ot the tables duringthe indexing),- move- 05 ment and causes this guard plate 202 to loe moved outward vto the extreme position shown in dotted lines. lWhen the tablesel have dompleted their indexing movement,

the two hinged guard plates 201, and 202 u" spring, back into close Contact with opposite ends ot the plate 200 mounted on the indeie ing;a member 20. lilith the 'guard platessin this .position the operative table 45 is completely enclosed thus preventing water H5 fr in being thrown out from the machine. ihe means for constantly lloodingthe wheel 17 and work W with water or other fluid comprises a conduit 210 extending from a pump 211 in the hase 10 of the machine. 120

rlhis conduit 21d may extend to a semicircular ring); directly below the wheel 1T to the opposite ends ot which i'lexihle tubes 213 may be fitted. These'tuhes 213- have nozzles 214l at their ends which may.l

he adiustahly positioned and held relative to the wheel 1T and work YV to properly `guide the flow ot water.

As the grinding operation is discontinued while the tables 45 are being indexed, it

desirable to interrupt the fior. ot Water Work W during' '.'his period. Il theretorc provide a valve casing1 in the Water su i il i conduit 2l() normal- .i

ly .having its `salve Qlt forced toward its closed position by a suitable spring 52117.

YifhisI spring;` 2l? may preferably he mounted Within an. extension to the casing- 215 to surround the valve stem 218. The valve stern 21S iis-extended from this valve casing' 215 to a point where its upper end may Contact with a cani 219 itted to and'tl'epending from the inlexing memberl Q0. rl"his cam Q19 is so located onthe member 2O that it is directly7 over the valve stem 218 when t'he member 2O is in one ot .its indexed positions. Two ot these cams 219 oppositely disposed on the member 2O are provided, one disposed thereon tor each of the indexed positions of the member 20. The valve stein i218, when it strikes one of these cams Q19, will be forced downward thus opening the valve 216 and iwrmittine- 'Water to :flow to the Wheel 17 and work W. Also the valve 216 will he open at all times during which the grinding;` operation is taking place. As soon, however, as the member 2O starts its movement to index the tables 45, the cam 219 is rotated array trom the valve stem Q18 and the valve 21.6 is closed by theI aetion ot the spring' 217. ln this Way the valve 216 is close]L during the entire period` ot the indexing movement but, as soon as the memberQO approaches each of its indexed positions7 the valve stem 218 strikes one of the cams' 219 thus again opening the valve 21.6 and permitting. the water to Hoi. l

Special means are incorporated in the base l() of the machine to direct the passage of the Water from the tables 4.3 to a reser voir provided either in the hase l0 or conveniently located adjacent thereto. From the tables 1125 the water drops to portions of the base l0 indicated at Spaced through this portion of the base l0 are bat- 'les 293 forming pockets between them which retain a part ot' the Water. Water overflows the baliles pass tlrrough the opening By means oit this construction, the major portionof the Water must pass through more than one pocket between the baflies 223 before it pases to the opening 224. While ,passing these battles, it may deposit a large -ianiount of the sediment which may be readilyy removed from the pockets i222.

The motor Z211- t'or rotating and indexing the tables 45 and mounted within the base l0 of vthe machine may he of any' type dependent vupon vthe source of current available. -As it is necessary to have direct current tor operating the nnicjnetie chucks 49, l rnovide a special generator 2"() Yfor this purpose.

As shown in Fig. i2, this generator Q30 may that it can lt not untilreoi, rra

be mounted Within the base l0 being attached to 'the levier snrtace ot aI horizontal part ot' the base in the saine manner as the motor lireterably the armature shafts oit the motor 3l and the lgenerator 230 are approXi- 740 mately in alignment'. and are connected together by means oi' a shaft 231 and a flexible joint 232.

What l claim is:

l. il snrt'ace grinding machine compris 75 dug in combination7 a base7 a rotatable Wheel mounted thereon upon a vertical axis, two work supporting and rotating tables, a rotatablc supporting member mounted within the base and carrying the tables at distance 89 from their axes ot rotation, means to actuate said member to alternately more said tables into and out of operative position relative to the Wheel, and means to rotate said tables while in their operative position, said means becoming automatically disengaged Whensaid tables are in their inoper' ative or loading position.

2. A surt'ace'grinding machine compris ing' in combination, a base7 a rotatable Wheel 90 mounted thereon upon a vertical axisj two Work supporting and rotating tables, a ro tatable suppo1"'ng member mounted Within the base and carrying the tables at a distance from 'their axes ot rotation, power 95 means to index said supporting member to alternately move said tables into and out olI operative position relative to the Wheel, l and trictionaliy driven means to index said mein/ber and to rotate said tables. m0

3. surface grinding` machine comprising in combination, a base, an abrasive wheel rotatably mounted adjacent thereto, means to adjust the position of said Wheel, a meinber rotatably mountedon said base, means to index said member one halt of one revolution, two tables mounted on diametrieally opposite parts of said member, vv'liereby indexing. movements of said member will alternately and successively move said bles U0 into and out ot operative position, tricion ally driven means to index said supporting member, and .means to rotate said tables` at any one of a plurality or' di florent speeds.

s. A surface grinding; machine eompris- U5 ing in combination7 a base, a rotatable Wheel mounted thereon, a plurality ot rotatable Work supporting tables, means to inovesaid tables alternately into and out oi operative position relative to the Wheel, and a gaging device comprisingl a rotatable --irnember mounted adjacent the operative position of the tables and adapted to be continuously contacted by the Wheel, and an indicator cn- ,ejag'ed by said member whereby the progress 125 ot die vgrinding operation can be observed.

A surface grinding machine comprising' in combination, a. base, a rotatable Wheel mounted thereoin a plurality'ot rotatable Work; supporting tables, means to move said mi Leonie/a tables alternately into `and out of operative position relative to thewheel, and a gag'ing device comprising a rotatable member adjacent the operative position of the tables and adapted to be continuously contacted by the 'ivlieeh lmeans to adjust the iosition oi the tion ot the rotatable member, said means being actuated with each of 'said table advancing movements. and an `indicator engaged by said rotatable member whereby the progress ot the grinding operation can be observed.

7. A surface grinding machine comprising in combination, a base, a Work supporting table on said base` a wheel head, a rotatable whcel in said wheel head, means conipi'ising a ratchetwheel and pawl to adjust the position of said Wheel relative to the table, magnetic means controlling the operative or inoperative position 'et the paivl to render the ii'heel adjusting means operative, and means rotating with the ratchet Wheel to discontinue the adjustment of the Wheel at any predetermined point in its doivn-v Ward movement.

8. sui-'tace grindingl machine comprising in combination, a base, a Work supporttable on said base, a, Wheel head, a rotatable wheel in said wheel head. means comprising a ratchet Wheel and paivl to adjust the position of said Wheel relative to the table, magnetic vmeans controlling the operative or inoperative position ol the paivl to render the wheel adjustingr means operative, and means to discontinue vthe adjustment ot the vivhcel at any predetermined point in its downward movement, the position of said last named means being adjustable on the ratchet Wheel.

9. A surface grinding machine comprising in combination', a base, a work supj'iorting table thereon, a wheel head having a Wheel spindle and wheel rotatably mounted therein and movable toward and from said table, means torotate said Wheel comprising a motor, and flexible connections between said motor and wheel spindle, said connections havingl an intermediate removable splined sliatt. 4

'10.,A surface grinding machine comprising in combination, a base, a Work supporting table thereon, a Wheel head having a wheel spindle and wheel rotatably mounted therein and movable toward and from said table` moans to rotate said Wheel comprising a motor.` splined sleeves respectively connected flexibly to said motor and Wheel spindle` said sleeves being in driving connection with each other by means of vrinintermediate reinovablesplined shaft. A

1.1. A surface grinding ymachine comprising in combination, a base', a work supporting table thereon, a wheel head having a ivli'eel spindle and wheel rotatably mounted therein and movable toward and from said tables, means to rotate said Wheel comprising a motor, splined sleeves respectivel connected by means of thin flexible disks to said motor and ivheelspindle, said sleeves being in driving connection with each other hy means of an intermediate removable splined shaft.

l2. A surface grinding machine comprising in combination, a base,a Work supporting/,table thereon, a Wheel "head having a wheel spindle and Wheel rotatably mounted therein and movable toward and from said table, means to rotate said wheel comprising amotor mounted Within the base upon an axis' and in alignment with the wheel spindle, and 'flexible connections between said motor and Wheel spindle. said connections itorming driving connections betweenVV said motor and Wheelv spindle permitting axialadjust-ment.

13. A surface. grinding machine comprising in combination, a:.base, a Work supporting table thereon, a ivheel head having a ii'hcel spindle and Wheel rotatably mounted therein and. movable toward and from said table, means to rotate said Wheel comprising a motor mounted Within the baseupon an axis in alignment with the Wheel spindle, and flexible connections comprising disks attached respectively to the said motor and wheel spindle, said connections forming driving connections between said motor and Wheel spindle permitting axial adjustmentnient.

14. A surface lgrinding machine comprising in combination, a base, two Work supporting tables thereon, a Wheel head having a wheel rotatably mounted therein and movable toivaid and from said table, means to index said tables alternately into operative position, water supplying means adapted to direct water upon the Wheel and Work during the grinding operation, and means to discontinue said supply of Water during theindexing movement.

l5. A surface grinding machine comprising in combination, Ia base, two Work supporting tables thereon, a Wheel head having a ivhccl rotatably mounted therein and movable toiard and from said table, a ro-, tatably supporting'member adapted to index lill TML@

' ing the 'grinding operation, and means on seid rotatable supporting member to control seid vSupply of Water during the grinding operation end permit` said supply to be dis--r continued 'during the indexing movement.

1G. surface J1grinding machine compris ing' in combination, e base, two work supn portinly tables thereon, e wheel heed having a Whee rotatably mounted therein and" movable toward end from seid trible e rotatable supporting member adapted to index seid tables elternetely int-o operative position, water-'supplying ineens odepted to direct Water upon the Wheel and Work durirreT the grinding operation, e Valve in seid Water supplying means to hold seid valve open duringr the grinding operation, end ineens permitting seid valve to close during the indexing movement.

17 A surface grinding machine compris ing in combination, a bese, two Work supporting tables thereona e Wheei heed bovino o wheel rotatably mounted therein. und movable toward and. `from seid table, a. rototable supporting member adapted to index seid tables alternately into operative posi` tion, writer vupplying means adopted to direct water upon the wheel :ind Werl; during the grinding operation, com ineens carried by said supporting member to normally maintain seid supply open, end :ineens to discontinue seid supply during the indexing movement.

momie Ineens to index Suid tables alternately into l operative position, guard plates enclosing the operative trible during' the grinding operation, one of said guards being carried by end movable with the indexingr means, the other guards beingI movable laterally to per mit indexing movement of the tables.

2G. A surface grinding; machine Comprising:r in combination, a base, two Work eupporting tables thereon, a Wheel heed huving wheel rotatably mounted therein7 and moons comprising e rotatable supporting; member to index seid tables alternately into operative position, e guard plate thereon partly enclosing the operative table duringr the grinding operation, und oppositely die posed gunrds movebly mounted on the rneeiine to permit indexing movement tables.

In testimony whereu, l hereto affix signature.

lli V 

